docs: def signed_session(self, session=None):
          # type: (Optional[requests.Session]) -> requests.Session
          """Create requests session with any required auth headers applied.
  
          If a session object is provided, configure it directly. Otherwise,
          create a new session and return it.
  
          :param session: The session to configure for authentication
          :type session: requests.Session
          :rtype: requests.Session
          """
          session = session or requests.Session()  # Don't call super on purpose, let's "auth" manage the headers.
          session.auth = oauth.OAuth2(self.id, token=self.token)
          return session